Emergency-aileron



'1. G. FOSTER.

EMERGENCY AILERON. APPLlcAUQN vFILED res. 25, 1920.

Patented Feb.22,'19211.

all: 7

PATENT OFFICE.

ISAAC G. FOSTER, OF PORTLAND, OREGON.

EMERGENCY-AILERON.

' specification of Letters Patent.

Patented Feb. 22, 1921.

Application led. February 25, 1920. Serial No. 361,150.

To all w hom t may concern.'

Be it hereby known that I, ISAAC Gr. Fos'rnn, a citizen of the United States, and a resident of Portland, in the county of Multnomah and State of Oregon, have invented certain new and useful Emergency-Ailerons, of which the following is a specification.

My invention relates more particularly to airplanes and means for righting same when in a nose dive.

The object of my invention is to provide an exceedingly simple and efficient means for bringing an airplane out of a nose dive when it is impossible to do so by the ordinary use of the ailerons and elevators.

I accomplish this result in the manner set forth in the specification followin and illustrated in the accompanying drawing, in which:

Figure 1 is an end elevation of an airplane shown in dotted lines with the new ailerons in the normal position shown in full lines. Fig. 2 is a plan of Fig. 1 shown in the same manner. Fig. 3 is a perspective view of my device and the means for operating same with the other parts eliminated.

Similar numbers of reference refer to the same or similar parts throughout the several views.

The ailerons which I am about to describe form a part of thev upper and lower main planes and adjacent to the fuselage, and on the rearward edge of the main planes 4 on each side of the fuselage 5 and forming a part of the main planes 4 are hinged the upper and lower ailerons 6 and 7 by means of the pivots 8. The ailerons 6 and 7 are operably joined by means of the strut 9 which is adapted to transmit similar motion to both of the ailerons 6 and 7. Motion is supplied to the aileron 7 by means of a pendent lever 10 rigidly attached to the member 7, which lever 1s joined by a connecting rod 11 to a second lever 12 mounted on the operating shaft 13 suitably journaled in bearings supported by the fuselage 5 and the main plane members 4. An emergency hand lever 14 conveniently placed within reach of the operator is mounted on the shaft 13 and is normally raised against the stop 15 and locked in this position by the sliding latch 16 whichv may be released by operating the hand grip 17.

It will be observed in Fig. 3 that when the lever 14 is in its locked position that the ailerons 6 and 7 occupy the same relation to the main plane members as would the similar area in the usual form of construction. However, when a pilot discovers his machine in a nose dive from which he is unable to extricate it, he operates the lever 14 which tends to depress the rearward edges of the ailerons 6 and7 on both sides of the machine, which action assists that of the elevators and rights the machine.

I have illustrated my device in a manner which will tend to right the plane by bringing it right side up, which operation, could of course,'be reversed if desired by merely permitting the lever 14 to operate in the opposite direction from thatwhich I have shown, without departing from the spirit of my invention.

It will also be observed that I have utilized thef stop 15 for limiting the upward movement of the ailerons 6 and 7. This, however, may be accomplished by placing an individual sto on each aileron consisting of a projecting ug on the under side of the aileron, or the upper side of the adjacent main plane at its rearward edge, or in any other manner most convenient for the purose.

While I have thus illustrated and described my invention it is not my desire to limit myself to this precise form or method of application, but intend that it shall coverall forms and modifications that fall fairly within the appended claims.

What I claim as new and desire to protect by Letters Patent of the United States is:

l. An airplane righting device consisting of a plurality of ailerons adapted to be operated in a downwardly direction at the same time, a stop means for preventing said ailerons from rising above their normal position, and a locking means for locking said ailerons in any position.

2. In an airplane righting device, the combination of an aileron on the rear edge of each main1 plane adjacent to the fuselage, each of said ailerons having a hinged union to said main plane in a manner that its rearward end may swing downwardly, a strut member between the upper and lower members of each pair of ailerons adapted to provide a uniform motion to both of the members of each pair, a pendent lever attached to the under side of each lower aileron, a connecting rod attached to the lower end of said pendent lever, a rocking arm attached to each connecting link, a shaft member adapted to operate said rocking arms simultaneously, a hand lever adapted to actuate said shaft, a stop means* arranged to limit the .motion of said hand lever in' one direc- 10 tion, and a lockingdevice adapted to secure said hand lever in such limited position.

ISAAC ROSTER. 

